﻿using UMC.SshNet.Common;

namespace UMC.SshNet.Security
{
    /// <summary>
    /// Represents "diffie-hellman-group16-sha512" algorithm implementation.
    /// </summary>
    internal sealed class KeyExchangeDiffieHellmanGroup16Sha512 : KeyExchangeDiffieHellmanGroupSha512
    {
        /// <summary>
        /// Defined in https://tools.ietf.org/html/rfc3526#section-5.
        /// </summary>
        private static readonly byte[] MoreModularExponentialGroup16Reversed =
            {
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x99, 0x31, 0x06, 0x34, 0xc9, 0x35, 0xf4, 0x4d,
                0x8f, 0xc0, 0xa6, 0x90, 0xdc, 0xb7, 0xff, 0x86, 0xc1, 0xdd, 0x8f, 0x8d, 0x98, 0xea, 0xb4, 0x93,
                0xa9, 0x5a, 0xb0, 0xd5, 0x27, 0x91, 0x06, 0xd0, 0x1c, 0x48, 0x70, 0x21, 0x76, 0xdd, 0x1b, 0xb8,
                0xaf, 0xd7, 0xe2, 0xce, 0x70, 0x29, 0x61, 0x1f, 0xed, 0xe7, 0x5b, 0x51, 0x86, 0xa1, 0x3b, 0x23,
                0xa2, 0xc3, 0x90, 0xa0, 0x4f, 0x96, 0xb2, 0x99, 0x5d, 0xc0, 0x6b, 0x4e, 0x47, 0x59, 0x7c, 0x28,
                0xa6, 0xca, 0xbe, 0x1f, 0x14, 0xfc, 0x8e, 0x2e, 0xf9, 0x8e, 0xde, 0x04, 0xdb, 0xc2, 0xbb, 0xdb,
                0xe8, 0x4c, 0xd4, 0x2a, 0xca, 0xe9, 0x83, 0x25, 0xda, 0x0b, 0x15, 0xb6, 0x34, 0x68, 0x94, 0x1a,
                0x3c, 0xe2, 0xf4, 0x6a, 0x18, 0x27, 0xc3, 0x99, 0x26, 0x5b, 0xba, 0xbd, 0x10, 0x9a, 0x71, 0x88,
                0xd7, 0xe6, 0x87, 0xa7, 0x12, 0x3c, 0x72, 0x1a, 0x01, 0x08, 0x21, 0xa9, 0x20, 0xd1, 0x82, 0x4b,
                0x8e, 0x10, 0xfd, 0xe0, 0xfc, 0x5b, 0xdb, 0x43, 0x31, 0xab, 0xe5, 0x74, 0xa0, 0x4f, 0xe2, 0x08,
                0xe2, 0x46, 0xd9, 0xba, 0xc0, 0x88, 0x09, 0x77, 0x6c, 0x5d, 0x61, 0x7a, 0x57, 0x17, 0xe1, 0xbb,
                0x0c, 0x20, 0x7b, 0x17, 0x18, 0x2b, 0x1f, 0x52, 0x64, 0x6a, 0xc8, 0x3e, 0x73, 0x02, 0x76, 0xd8,
                0x64, 0x08, 0x8a, 0xd9, 0x06, 0xfa, 0x2f, 0xf1, 0x6b, 0xee, 0xd2, 0x1a, 0x26, 0xd2, 0xe3, 0xce,
                0x9d, 0x61, 0x25, 0x4a, 0xe0, 0x94, 0x8c, 0x1e, 0xd7, 0x33, 0x09, 0xdb, 0x8c, 0xae, 0xf5, 0xab,
                0xc7, 0xe4, 0xe1, 0xa6, 0x85, 0x0f, 0x97, 0xb3, 0x7d, 0x0c, 0x06, 0x5d, 0x57, 0x71, 0xea, 0x8a,
                0x0a, 0xef, 0xdb, 0x58, 0x04, 0x85, 0xfb, 0xec, 0x64, 0xba, 0x1c, 0xdf, 0xab, 0x21, 0x55, 0xa8,
                0x33, 0x7a, 0x50, 0x04, 0x0d, 0x17, 0x33, 0xad, 0x2d, 0xc4, 0xaa, 0x8a, 0x5a, 0x8e, 0x72, 0x15,
                0x10, 0x05, 0xfa, 0x98, 0x18, 0x26, 0xd2, 0x15, 0xe5, 0x6a, 0x95, 0xea, 0x7c, 0x49, 0x95, 0x39,
                0x18, 0x17, 0x58, 0x95, 0xf6, 0xcb, 0x2b, 0xde, 0xc9, 0x52, 0x4c, 0x6f, 0xf0, 0x5d, 0xc5, 0xb5,
                0x8f, 0xa2, 0x07, 0xec, 0xa2, 0x83, 0x27, 0x9b, 0x03, 0x86, 0x0e, 0x18, 0x2c, 0x77, 0x9e, 0xe3,
                0x3b, 0xce, 0x36, 0x2e, 0x46, 0x5e, 0x90, 0x32, 0x7c, 0x21, 0x18, 0xca, 0x08, 0x6c, 0x74, 0xf1,
                0x04, 0x98, 0xbc, 0x4a, 0x4e, 0x35, 0x0c, 0x67, 0x6d, 0x96, 0x96, 0x70, 0x07, 0x29, 0xd5, 0x9e,
                0xbb, 0x52, 0x85, 0x20, 0x56, 0xf3, 0x62, 0x1c, 0x96, 0xad, 0xa3, 0xdc, 0x23, 0x5d, 0x65, 0x83,
                0x5f, 0xcf, 0x24, 0xfd, 0xa8, 0x3f, 0x16, 0x69, 0x9a, 0xd3, 0x55, 0x1c, 0x36, 0x48, 0xda, 0x98,
                0x05, 0xbf, 0x63, 0xa1, 0xb8, 0x7c, 0x00, 0xc2, 0x3d, 0x5b, 0xe4, 0xec, 0x51, 0x66, 0x28, 0x49,
                0xe6, 0x1f, 0x4b, 0x7c, 0x11, 0x24, 0x9f, 0xae, 0xa5, 0x9f, 0x89, 0x5a, 0xfb, 0x6b, 0x38, 0xee,
                0xed, 0xb7, 0x06, 0xf4, 0xb6, 0x5c, 0xff, 0x0b, 0x6b, 0xed, 0x37, 0xa6, 0xe9, 0x42, 0x4c, 0xf4,
                0xc6, 0x7e, 0x5e, 0x62, 0x76, 0xb5, 0x85, 0xe4, 0x45, 0xc2, 0x51, 0x6d, 0x6d, 0x35, 0xe1, 0x4f,
                0x37, 0x14, 0x5f, 0xf2, 0x6d, 0x0a, 0x2b, 0x30, 0x1b, 0x43, 0x3a, 0xcd, 0xb3, 0x19, 0x95, 0xef,
                0xdd, 0x04, 0x34, 0x8e, 0x79, 0x08, 0x4a, 0x51, 0x22, 0x9b, 0x13, 0x3b, 0xa6, 0xbe, 0x0b, 0x02,
                0x74, 0xcc, 0x67, 0x8a, 0x08, 0x4e, 0x02, 0x29, 0xd1, 0x1c, 0xdc, 0x80, 0x8b, 0x62, 0xc6, 0xc4,
                0x34, 0xc2, 0x68, 0x21, 0xa2, 0xda, 0x0f, 0xc9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0x00
            };

        public override BigInteger GroupPrime
        {
            get
            {
                return new BigInteger(MoreModularExponentialGroup16Reversed);
            }
        }

        /// <summary>
        /// Gets algorithm name.
        /// </summary>
        public override string Name
        {
            get { return "diffie-hellman-group16-sha512"; }
        }
    }
}
